Device for holding the weft in looms



July 4, 1967 LU 3,329,176

DEVICE FOR HOLDING THE WEFT IN LOOMS Filed Sept. 21, 1964 I NVEN TOR.IVQ/fl/IZ} ann United States Patent 3,329,176 DEVICE FOR HOLDING THEWEFT IN LOOMS Heinrich Fliihmann, Krefeld, Germany, assignor to CarlLangs, Aktiengesellschaft, Krefeld, Germany Filed Sept. 21, 1964, Ser.No. 397,833 6 Claims. (Cl. 139-194) The present invention relates to adevice for holding the weft in looms, more specifically, to a device ofthe above mentioned type for avoiding jump or skip wefts Springschiisse) It is known that in particular with a smooth weftmaterial as, for instance nylon and other synthetic threads, the threaddetaches itself from the weft bobbin and snaps back into the shed whileforming loops and so-called jump or skip wefts. When the sley beats upsuch a weft, small irregular spots are formed in the fabric whichharmfully affect the appearance and quality of the goods.

In order to avoid these faults, the weaver has to coat the end of thepath of the sley with hide or skin pieces, plush, or similar material.These materials brake the movement of the thread so that the formationof loops within the shed is decreased. The quality and appearance of thewoven goods is improved, however, the abovementioned fault cannot becompletely eliminated.

It is, therefore, an object of the present invention to provide a devicefor use in connection with looms which will overcome the above-mentioneddrawbacks.

It is a further object of the present invention to provide a device asset forth in the preceding paragraph which will prevent Weaving faultsand in particular jump or skip wefts (Springschiisse).

These and other objects and advantages of the invention will appear moreclearly from the following specification in connection with theaccompanying drawing, in which:

FIGURE 1 is a side view of a loom provided with the suction deviceaccording to the present invention;

FIGURES 2 to ,5 illustrate various positions of the suction nozzles ofthe suction device according to the present invention with regard to theposition of the shuttle of the loom.

The device according to the present invention is characterized primarilyin that one suction pipe each provided with a suction nozzle is arrangedin the vicinity of each marginal portion of the fabric. The suctionnozzle serves for holding the weft due to its sucking effect and totighten the same while it is also adapted to release the taut weft whenthe shuttle sloughs for filling the weft. In this way, skip wefts andloose filling wefts are avoided which otherwise occur particularly withhigh speed looms. Furthermore, the arrrangement according to the presentinvention yields a neat and proper form of the selvage. Each weft isfully equally stretched and the whole weave looks better and moreuniform than previously.

The suction nozzles furthermore serve the purpose of sucking off theweft ends cut off by the scissors during a change of wefts.

Referring now to the drawing in detail, the loom illustrated in FIG. 1comprises a frame 1, a main machine shaft 2, a connecting rod 3, and asley 4 tiltable about a shaft 5. A further shaft 6 drives, through theintervention of an eccentric 7 provided thereon, a two-arm lever 8tiltably journalled of a shaft 9. One side of the twoarm lever 8 isdesigned as a suction pipe 10 which is arranged with regard to the sley4 in such a way that the mouth of a nozzle 11 connected to pipe 10 isadapted to suck in a weft 12. The suction pipe 10 has connected theretoa flexible hose 13 which in turn is connected to a blower (not shown).One suction pipe 10 with a corresponding nozzle 11 is provided in thevicinity of each of the two marginal portions 16 of the fabric.

When a shut-tle 14 leaves the shed, the suction pipe 10 moves throughthe intervention of the eccentric 7 against the Weft 12 and sucks in thesame. Thereafter, the suction pipe 10 swings, actuated by the eccentric7 together with the sley 4, toward the weavers stand, as shown in FIG.3. The suction nozzle 11 remains in this position until the shuttle 14is shot through the new shed. The weft 12 held by the mouth of nozzle 11of the suction pipe 10 as before, now is pulled out of the mouth ofsuction nozzle 11 due to the tension exerted by the shuttle on the weftduring its fly through the shed. When the shuttle arrives on theopposite side of the loom, the weft is grasped by the oppositely locatedsuction pipe 10 or the suction nozzle 11 thereof and tightened (see FIG.5). This process is repeated in rhythm with the shot of the shuttle.

During a change of bobbins, the weft end is sucked in by the suctionnozzle 11 and held until the temple cutter 15 (see FIG. 5) has cut theweft at the selvage.

It Will be seen that the retraction of each nozzle from the sley notonly prevents the nozzles from interfering with the tilting movements ofthe sley but also position the nozzle gripping a Weft thread insubstantial alignment with the thread after it is heat into the fabric,thus holding the thread in the proper position.

It is, of course, to be understood that the present invention is, by nomeans, limited to the particular construction shown in the drawing, butalso comprises any modifications within the scope of the appendedclaims. Thus, in particular, the suction nozzles and the control of themovement of the suction nozzles may have a different design thandisclosed in the drawing and described above.

What is claimed is:

1. In a loom; a tiltable sley, a shuttle moveable along the sley througha shed to deposit a weft thread in the shed, and a suction nozzle ateach lateral side edge of the shed disposed adjacent the path of theweft thread being placed in the shed on the fabric side of the shed andadapted to grasp the thread when the shuttle passes the respectivesuction nozzle, a respective pivotal support in the loom for eachsuction nozzle providing for movement thereof in the direction oftilting movement of said sley and independently of said sley, and meansfor moving each of said suction nozzles about its respective pivotalsupport in timed relation to the movement of said shuttle and thetilting movement of said sley.

2. In a loom; a tiltable sley, a shuttle moveable along the sley througha shed to deposit a weft thread in the shed, and a suction nozzle ateach lateral side edge of the shed disposed adjacent the path of theweft thread being placed in the shed on the fabric side of the shed andadapted to grasp the thread when the shuttle passes the respectivesuction nozzle, a two armed lever for each suction nozzle having therespective nozzle on the end of one of the arms, respective pivot meansin the loom supporting each of said levers for tilting movement of eachlever to move each of said nozzles pertaining thereto in the directionof movement of said sley and independently of said sley, and cam meansengaging the other arm of each lever for tilting each of said levers intimed relation to the tilting of said sley and the movement of saidshuttle.

3. In a loom; a tiltable sley, a shuttle moveable along the sley todeposit weft threads in the shed of a fabric being woven in the loom, asuction nozzle at each lateral side edge of the fabric adjacent the pathof the weft thread being placed in the shed on the fabric side of theshed adapted releasably to grip the weft thread when the shuttle passesthe respective suction head, means supporting said nozzles in the loomfor movement therein in the same direction of movement as that of saidsley, and means for moving each suction head toward the sley prior topassage of the shuttle conveying a weft thread past the respectivesuction nozzle, and for moving the suction head toward the fabric priorto the movement of the shuttle toward the other suction nozzle, eachsaid nozzle gripping the weft thread therein with such force as torelease the weft thread. gripped therein in response to the tensionapplied to the said thread by movement of the shuttle toward theopposite end of the sley.

4. A method of weaving fabric in a loom having a sley and a shuttleslidable thereon for depositing weft threads in the shed of a fabricbeing woven in the loom which includes the steps of; positioning asuction nozzle with the mouth thereof adjacent the path of the weftthread on the fabric side of the shed between each side edge of thefabric being woven and the adjacent terminal position of the shuttle sothat the shuttle carries the weft threads past the mouth of each saidnozzle, drawing air from the interior of each nozzle to develop asuction in the mouth of each said nozzle to cause the nozzles to gripthe weft threads as the shuttle passes the respective nozzle whilepermitting the respective weft threads to be pulled from the nozzles bythe tension applied to the weft threads by the shuttle in its movementalong the sley, and moving each suction nozzle independently toward andaway from said sley in timed relation to the movement of said shuttleand in the same direction of movement as that taken by the sley.

5. A method of weaving fabric in a loom having a sley and a shuttleslidable thereon for depositing weft threads in the shed of a frabricbeing woven in the loom which includes the steps of; positioning asuction nozzle with the mouth thereof adjacent the path of the weftthread on the fabric side. of the shed between each side edge of thefabric being woven and the adjacent terminal position of the shuttle sothat the shuttle carries the weft threads past the nozzles, drawing airfrom the interior of each nozzle to develop a suction in the mouth ofeach said nozzle to cause the nozzles to grip the weft threads as theshuttle passes the respective nozzle while permitting the weft threadsto be pulled from the respective nozzles by the tension applied to theweft threads by the shuttle in its movement along the sley, moving eachnozzle independently toward the sley prior to the approach of theshuttle from the opposite end of the sley, moving each nozzleindependently away from the sley prior to movement of the shuttle awayfrom the adjacent end of the sley and toward the opposite end thereofand effecting the movement of said nozzles in the same direction as thedirection of movement taken by said sley.

6. A method of weaving fabric in a loom having a sley and a shuttleslidable thereon for depositing weft threads in the shed of a fabricbeing woven in the loom which includes the steps of; positioning asuction nozzle with the mouth thereof adjacent the path of the weftthread on the fabric side of the shed between each side edge of thefabric being woven and the adjacent terminal position of the shuttle sothat the shuttle carries the weft threads past the nozzles, drawing airfrom the interior of each nozzle to develop a suction in the mouth ofeach said nozzle to such a degree as to cause the nozzles to grip theweft threads as the shuttle passes the respective nozzle whilepermitting the weft threads to be pulled from the respective nozzles bythe tension applied to the weft threads by the shuttle in its movementalong the sley, moving each nozzle independently toward the sley into aposition closely adjacent the path of the shuttle prior to the approachof the shuttle from the opposite end of the sley, moving each nozzleindependently away from the sley into approximate alignment with thebeat-in position of the weft thread gripped in the nozzle prior tomovement of the shuttle away from the adjacent end of the sley andtoward the opposite end thereof and effecting the movement of saidnozzles in the same direction as the direction of movement taken by saidsley.

References Cited UNITED STATES PATENTS 1,921,396 8/1933 Pool 139-194 X1,963,098 6/1934 Pool 139194 2,089,620 8/1937 Rossmann 139194 2,762,3999/1956 Moseley et a1. 139--170.3 2,842,164 7/1958 Head 139-17032,906,296 9/1959 Ancet et a1. 139291 3,050,088 8/1962 Schaffer 139194 X3,147,778 9/1964 Reyes 139-303 3,186,444 6/1965 Schaffer 139-194 X3,213,892 10/1965 Fluhmann 139-194 X FOREIGN PATENTS 1,237,767 6/1960France.

1,348,802 12/1963 France.

1,352,200 1/1964 France.

MERVIN STEIN, Primary Examiner.

DONALD W. PARKER, Examiner.

J. KEE CHI, Assistant Examiner.

1. IN A LOOM; A TILTABLE SLEY, A SHUTTLE MOVEABLE ALONG THE SLEY THROUGHA SHED TO DEPOSIT A WEFT THREAD IN THE SHED, AND A SUCTION NOZZLE ATEACH LATERAL SIDE EDGE OF THE SHED DISPOSED ADJACENT THE PATH OF THEWEFT THREAD BEING PLACED IN THE SHED ON THE FABRIC SIDE OF THE SHED ANDADAPTED TO GRASP THE THREAD WHEN THE SHUTTLE PASSES THE RESPECTIVESUCTION NOZZLE, A RESPECTIVE PIVOTAL SUPPORT IN THE LOOM FOR EACHSUCTION NOZZLE PROVIDING FOR MOVEMENT THEREOF IN THE DIRECTION OFTILTING MOVEMENT OF SAID SLEY AND INDEPENDENTLY OF SAID SLEY, AND MEANSFOR MOVING EACH OF SAID SUCTION NOZZLES ABOUT ITS RESPECTIVE PIVOTALSUPPORT IN TIMED RELATION TO THE MOVEMENT OF SAID SHUTTLE AND THETILTING MOVEMENT OF SAID SLEY.